Hydraulic control for glass pressing machines



Juhe 10, 1958 A. E B-RYMER, JR

HYDRAUL IC CONTROL FOR GLASS PRESSING MACHINES 4 Sheets-Sheet 1 Filed Aug. 24, 1955 I INVENTOR. 1O "/IMDZEWE'Z/NEB, (1?.

BY 7% 6M V June 1958 A. E BRYMER, JR ,872

HYDRAULIC CONTROL FOR GLASS PRESSING MACHINES Filed Aug. 24, 1955 4 Sheets-Sheet 3 V lll /////////F// June 10, 1958 A. E BRYMER, JR 2,837,872

HYDRAULIC CONTROL FOR GLASS PRESSING MACHINES Filed Aug. 24, 1955 4 Sheets-Sheet 4 ZU- 4, M

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2,837,872 7 HYDRAULI CONTROL FOR GLASS runssnvo MACHINES Andrew Brymer, In, Toledo, Ohio, assignor to Owens- "Illinois ,Gl ass'company, a corporation of Ohio Application August 24,1955, Serial No. 530,309

4 Claims, (c1. sec-as Myinvention pertains to machines for pressing and blowing glass articles, and in particular to mechanisms for controlling the movements of the pressing plunger to and from press forming positions. Among the objects of this'i-nvention is theprovision of a device permitting the operator to withdraw the plunger from press position in the event of mechanical interference in other portions of the machine. 7

A further object is the provision of a device for automatically preventing the movement of the pressing plunger into pressing position with the failure of the power.

In the drawings Fig. dis a partial elevational view of a glass forming unit illustrating the pressing position of such forming unit; Fig. 2 is a plan view taken approximately at the line II--ll on Fig. 3;

Fig. 3 is a part sectional elevation through the hydraulic operating mechanism for the plunger taken at line III- ill on Fig. 2 with the plunger in the retracted position;

Fig. 4 -is a part sectional elevation taken at line III-III on Fig. Z-shoWing thehydraulic plunger operating parts in the pressing position; and

' Fig. 5 is a diagram of the hydraulic circuit for this mechanism.

In the drawings, is a base upon which is mounted a column 11 supporting the hydraulic operating mechanisms for the pressing plunger. These mechanisms are monnted in an'enclosi'ng head 12 at the top of the column 11 and a removable hood 13 is provided permitting access to these mechanisms. A table 15 supports a rotatable carrier 16 upon which is mounted a series of neck molds 1*7 arrangedto be moved to and from pressing and blowing positions. The carrier 16 is mounted on a vertical shaft '18 which is driven step-by-step from a motor drive, not shown.

At one station the neck molds 17 are maintained in operative position and arranged to cooperate with a press mold 20 mounted on the top end of a vertical piston 21. The press mold 20 is moved to and from its operative position with the neck molds 17 by an air motor 25. Directly above the press mold 20 is a pressing plunger 26 adapted for vertical movement to and from the operative position in cooperative alignment with the neck molds 17. When the glass parisons have been pressed to shape, the carrier 16 is adapted to transfer them to' the blow mold 30 where they are enclosed by said mold, and the blowing head 31 is adapted to be seated on the carrier 16 and to provide blowing air to expand the parison to hollow shape in the blow mold 30.

All of these operations may be controlled by any well known timing device.

In the operation of such mechanisms and in particular the pressing mechanisms, any power failure or mechanical interference is apt to be highly detrimental to the forming mechanisms, particularly if such failure happens during the pressing operation. In any such instance, if the 2 plunger 26 and the molds 17 and 20 are permitted to remain in pressing position, the glass will freeze to the plunger and the molds, and the subsequent separation of these parts will result in damage to all three members.

Therefore, the essence of this invention is to provide a safety means particularly for preventing the pressing plunger everremaining in such pressing or any other obstructing position, and second, to prevent the plunger from moving down to pressing position in the event of any power failure or mechanical interference.

'Mounted in the head 12 is a vertical shaft 35 carrying at its lower end the pressing plunger 26, said shaft having attached to its top end a cross arm 36 with a second cross arm 37 attached to its lower end and forming in effect an I-shaped member or combined crosshead. A pair of floating pistons 38, 39 mounted in cavities 40, 41 in head 12 are adapted for free contact with the upper cross arm 36 for raising the plunger 26 out of pressing position. A second pair of floating pistons 50, 51 mounted in cavities 52, 53in the head 12 are also adapted for free contact with the lower cross arm 37 to lower the pressing plunger to pressing position. The upper cross arm 36 has a locking finger 56 formed at one end which is adapted for engagement with locking teeth 57 formed on the inner face of a lock bar 58. The said lock bar being fulcrumed at 60 on the head 12 and having an extension 61 arranged for contact with a piston valve 62. The lock bar 58 is held in normal vertical position by a spring 63 adapted for contact with the extension'6l, and said lock bar is prevented from going beyond vertical position by contact with the surface 65 of the bracket 70.

The normal operation of this locking mechanism is such that when hydraulic or fluid pressure is provided from a constant pressure source, it flows to the opening in the bracket 70 and provides pressure upon the top end of the piston valve 62 which is in contact with the extension 61 of the lock bar 58. Pressure applied to this valve 62 moves the extension 61 against the pressure of spring 63, and will hold the lock bar 58 in retracted position such as shown by the dotted lines in Fig. 4.

With any cutting off of the fluid pressure or hydraulic power from the main supply source, pressure will be instantly released upon the valve 62 and spring 63 will automatically move the lock bar 58 into its locking position as shown in Fig. 3. If the pressing plunger 26 is in up position at that time, it will be automatically locked in up position as shown in Fig. 3. If it has started on its downward stroke, it will automatically come into contact with one of the many teeth 57 provided on lock bar 58 and be automatically stopped at whatever point it has reached in its downward motion.

With the parts in the position shown in Fig. 3, the cycle of operation will be as follows:

In accordance with the fluid or hydraulic diagram shown in Fig. 5, the various fiuid valves are shown posi-. tioned to maintain the cross arm 36 in its top position. A master valve block 106 mounted within the table sup.- port 15 is so arranged that the valve 101 is in contact with a rotating cam 102 and is riding the short radius surface of said cam preparatory to being moved to its next succeeding position. As the valve 101 is shifted by continued rotation of cam 1G2, fluid under constant pressure enters through line 103 passing to conduit 104 through a pressure regulating valve 105, thence through line M6 to ports 107 and to the top of the pistons 50 and 51 in the cavities 52, 53 in the head 12. This pres sure on pistons 50 and 51 simultaneously moves the joined cross arms 36, and 37 downwardly bringing the plunger 26 and its cooperating parts into the pressing or forming position, as shown in Fig. 4.

The pressure regulating valve 105 permits obtaining desirable pressing pressures upon the pistons 50 and 51 and in turn upon the press plunger 26 in orderthat the pressure applied to each indiyidual charge of glass may be regulated and controlled. As the plunger 26 approaches its lower pressing position, the valve 150 is lowered to restrict the flow of fluid from cavities 40 and 41. Ti1;'ChCk valve 133 prevents any flow of fluid through line 132, thus causing all the back flow to be through lines 136 and 136 to the control portion 164 of valve 153. The fluid then passes through line 131 to and through valve block 124, line 130, and past the valve 101 which is. then in a position to open line 130 to the exhaust line 1315 This shifting of valve 161 is previously mentioned above. This permits accurate control of the speed of the stroke of the plunger 26 at the end of its pressing stroke and prevents hard impact with the glass.

During all, the preceding mechanical operation, constant fluid pressure has been maintained from a constant fluid source 110 through lines 103, 111, 112 and 113. It will be noted that lines 1413, 111 and 113 are constant source lines and have no direct interconnection. The constant fluid pressure through line 111 enters into a valve block 126, thence through line 121 to a chamber 113 beneath a piston valve 122 in valve block 124. This constant pressure maintains this valve piston 122 in its up position at all times with the sole exception of such time as this pressure is released by the machine operator through the actuation of a two-way valve 123 mounted in pressure line 1112*. With the completion of the pressing operation, the continued rotation of cam 102 permits the valve 131 to move back into the position shown in Fig. 5, thus permitting fluid under pressure to enter through line 139, through the valve 122, line 131 into valve block 123. The pressure fluid then flows through line 132 to open the check valve 133 and permit fluid to flow through line 134 to the ports-135 in the piston chambers 4i and 41, thus moving pistons 38 and 39 upwardly and through their free contact with cross arm 36 causing the shaft 35 and its integral cross arms 36, 37 to move as a crosshead upwardly into the position shown in Figs. 3 and 5. The upward movement of pistons 38 and 39 causes a like movement of pistons 50 and 51 due to their free contact with cross arm 37 and such movement forces the fluid out of cavities 52 and 53 through ports 167. This fluid flows back through line 106 through check valveltld to line 104 and out through exhaust port 100 in the valve block 100.

if at this point in the operating cycle or at any other point in said cycle, some physical interference occurs with the machine mechanisms which necessitates that the pressing plunger 26 be restricted from moving into pressing position, the operator may, by moving the two-Way valve 123, discontinue the pressure from pressure source 110 to the line 111. This actuation of valve 123 permits the fluid in lines 133, 111, 112, and 121 to drain back to a sump tank through line 123* and releases the pressure on valves 122 and 159 and on pin 62 of the plunger locking mechanism 33. This action permits the piston valve 122 to move downwardly, closing off the lead line 130 and permits the constant pressure fluid to pass through line 113 past the valve 122 through line 131 around valve 151} to line 132. The fluid depresses check valve 133 and flows to line 134 into the cavities 40 and 41 to retain the crosshead and the press plunger 26 in the up position as shown in Fig. 5. With this release of the constant pressure on line 111, through actuation of the twoway valve 123, the pressure is also simultaneously released on line 112 and above the piston 62, thus permitting the spring 63 to move the lock rack 58 into operative position as shown in Figs. 3 and 4, locking the crosshead 36 in-its top position. This release of pressure on line 112 permits the fluid to flow back through line 112 to valve block 120, through channel 112*, line 111 to exhaust through line valve 123.

It should be apparent that if the valve 123 is actuated when the plunger 26 is in its pressing position, the constant pressure through line 113 will act to raise the combined crosshead of cross arms 36, 37 and the plunger 26 into the'up position as in Fig. 3 because the constant pressure to line 103 will be simultaneously stopped and vented to the atmosphere through valve 123. Through this mechanism it is therefore, almost impossible for the pressing plunger to move to or remain in a position where it might interfere with any other moving parts of the machine.

If, for any reason, all of the pressure in all of the constant pressure lines is released, the lock bar 58 will be automatically moved into locking position by the spring 63, thus retaining the cross arm 36 in its top position or at any intermediate position along the several teeth 57 on the inner face of the lock bar 58. Under such circumstances, if the cross arms 36 and 37 are in the down position, they may be raised by hand and the lock bar 58 will retain them in any desired up position.

The operation of the mechanism in sequence is as follows:

The cam 102 will during rotation, shift the valve 101 and fluid will be provided to the tops of cavities 52 and 53 moving the floating pistons 51} and 51 downwardly in free contact with the cross arm 37. This free contact as between these two pistons and the cross arm 37 brings the pressing plunger 26 downward into pressing cooperation with the mold 30 for pressing a parison or a completely pressed article as the case may be.

in order that the downward motion of the press plunger 26 may be rapid, and yet the contact thereof with the glass may not be of high impact force, a means is provided to cushion the last increment of the down stroke. Provided in the block is a piston valve having a rod extension 151 positioned in a small cylinder 152.

Constant fluid pressure from line 111 enters cylinder 152 through port 153 and applies pressure to the flat end of rod 151 and thereby maintains the valve 150 in its up position. The area of the flat end of rod 151 is just sutficient to raise the weight of the valve 150. So long as the valve 150 is in its up position the full exhaust and fluid from beneath the pistons 38 and 39 through lines 132 and 131 remains constant. However, as the pistons 38 and 39 approach the end of their down stroke, a lever 160, attached to the cross arm 36 and fulcrumed on bracket 161 at 162, contacts the top end of valve 150 moving it downward to restrict the flow of fluid through lines 131 and 132. I

A flat surface 163 on the outer cylindrical surface portion 165 of the valve 150 permits a continued but restricted exhaust of fluid and prevents any high impact force of the press plunger 26 upon the glass and between the other mechanical parts. i 0

With the completionv of the pressing of the glass, the valve 101 is shifted to the position shown in Fig. 5 permitting fluid to enter into the cavities 40 and 41 under the pistons 38 and 39 and through their free or floating contact with cross arm 36 they will withdraw the pressing plunger 26 from its cooperation with the mold 20 and move it into the position shown in Fig. 1. With the shifting of valve 101, as disclosed immediately above, the fluid in cavities 52 and 53 will exhaust through ports 137, lines 1136 and 104 to the exhaust port 100 of valve 7 block 100. This relieves the pressure on pistons 50 and 51 and permits the constant fluid pressure from line 113 to raise the plunger 26 from pressing position and the lock 53 to move the locking position as in Fig. 3.

In order to eccentuate the essence of this invention, it will be assumed that the table 16 has failed to index, its parts have remained in the position shown in Fig. 1 and with the previously pressed parison still in the mold 20. The machine timing is such that the pressing 76 plunger 26 is about to again move down into cooperative position with press mold 2% due to pressure on pistons 59 and 51. Under such circumstance the operator will actuate the two-way valve 123 releasing the fluid pressure in lines 103, 111 and 112 as well as under the piston valves 122 and 150, thus bringing into operation the second constant pressure source, viz.,' line 113, which will act to retain the cross arm 37 and the pressing plunger 26 in the up position. At the same time the release of pressure on line 1.12 and valve 62, permits the lock bar 58 to move in and lock the cross arm 36 in its up position. The parts will remain in this locked position until such time as the operator again actuates valve 123 to provide constant pressure to lines 103, 111, and 112 and to the valve block 120.

This application is a continuation-in-part of my former application, S. N. 454,130, filed September 3, 1954, now abandoned.

Modifications may be resorted to within the spirit and scope of the appended claims.

I claim:

1. In an apparatus for pressing molten glass, the combination which includes a pressing head, a crosshead shaft extending through said head, opposing cross arms formed on each end thereof one of said cross arms disposed above and one below said head, said crosshead shaft and arms mounted for vertical movement relative to said head, pairs of vertically movable pistons arranged in said head between said opposing cross arms, each pair of said pistons having actuating contact with only one of said cross arms, each pair of said pistons being adapted for alternate communication with a controlled source of fluid pressure, means to alternately aply fluid pressure to each pair of pistons, and means adapted to supply a separate constant pressure on one pair of pistons upon the cessation of the normal supply of pressure thereto.

2. In an apparatus for pressingmolten glass, the combination which includes a pressing head, a vertical crosshead shaft extending through said head, opposing cross arms formed on each end thereof, one of said cross arms disposed above and one below said head, said crosshead shaft and arms mounted for vertical movement relative to said head, pairs of vertically movable pistons arranged in said head between said opposing cross arms, each pair of said pistons having actuating contact with only one of said cross arms, means to alternately apply fluid pressure to one end of each pair of pistons, and means adapted to supply a separate constant pressure on one pair of said pistons upon the cessation of the normal supply of pressure thereto.

3. In an apparatus for pressing molten glass, the combination which includes a pressing head, a vertical crosshead shaft extending through said head, opposing cross arms formed on each end thereof, one of said cross arms disposed above and one below said head, said crosshead shaft and arms mounted for vertical movement relative to said head, a first pair of vertically movable pistons arranged in said head and adapted to contact the top cross arm, a second pair of pistons having actuating contact with the lower cross arm, each pair of said pistons being adapted for alternate communication with a controlled source of fluid pressure, means to alternately supply fluid pressure to said first and second pairs of pistons, and means adapted to supply a separate constant pressure on said first pair of pistons upon cessation of the normal supply of pressure thereto.

4. In an apparatus for pressing molten glass, the combination which includes a pressing head, a crosshead shaft extending through said head, opposing cross arms formed on each end thereof one of said cross arms disposed above and one below said head, said crosshead shaft and arms mounted for vertical movement relative to said head, pairs of vertically movable pistons arranged in said head between said opposing cross arms, each pair of said pistons having actuating contact with only one of said cross arms, each pair of said pistons being adapted for alternate communication with a controlled source of fluid pressure, means to alternately apply fluid pressure to each pair of pistons, means adapted to supply a separate constant pressure on one pair of pistons upon the cessation of the normal supply of pressure thereto, and means to prevent vertical movement of said cross arms upon cessation of said normal pressure.

References Cited in the file of this patent UNITED STATES PATENTS 1,995,653 Rowe Mar. 26, 1935 

